К подлежащему:
Who came to visit him one day?
Специальный вопрос:
When did his cousin from (пропущено откуда) come to visit him?
Общий:
Did his cousin from (London/Kolpino/…) come to visit him one day?
поставьте к приложению вопросы к подлежащему и к специальный вопрос срочноone day his cousin from came to visit him.
